Flora of North America species comparison

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Ageratina havanensis

Ageratina lemmonii

Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower

Lemmon's snakeroot
Habit Shrubs [trees], (30–)69–150(–200) cm. Perennials, 20–40(–70) cm (densely fibrous-rooted crowns).
Stems

erect (brittle), puberulent to glabrous.

(commonly purple) erect, puberulous (hairs usually with colored crosswalls).
Leaves

persistent, opposite;

petioles 3–10(–15) mm;

blades deltate to broadly ovate or somewhat hastate, (2–)3–5(–8) × 2–5 cm, bases truncate to cuneate, margins dentate, apices acute, faces glabrous or nearly so, eglandular.

opposite;

petioles usually 0, sometimes 1–2 mm;

blades ovate-lanceolate, 2–4.5 × 0.5–2.5 cm, margins shallowly serrate, abaxial faces glabrous or glabrate, gland-dotted.
Peduncles

2–14 mm, minutely puberulent.

10–60 mm, puberulent.
Involucres

4–6 mm.

4–5.5 mm.
Corollas

white to slightly pinkish, glabrous.

white, lobes densely hispid-villous.
Phyllaries

apices acute, abaxial faces glabrous or nearly so.

(narrowly oblong-lanceolate) apices acute, abaxial faces sparsely hairy to glabrate.
Heads

clustered.

in loose, open arrays.
Cypselae

hispid.

sparsely and finely hispidulous.
2n

= 34.

= 34.

Ageratina havanensis

Ageratina lemmonii
Phenology Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul. Flowering Aug–Oct.
Habitat Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands Rocky slopes, mostly in pine-oak woodlands
Elevation 100–900 m (300–3000 ft) 1800–2800[–3300, Mexico] m (5900–9200[–10800, Mexico] ft)
Distribution
from FNA
TX; Mexico; West Indies (Cuba)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; Mexico
[BONAP county map]
Discussion

Ageratina havanensis apparently is the only species of the genus in the flora area with evergreen-persistent leaves.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 552. FNA vol. 21, p. 551.
Parent taxa Asteraceae > tribe Eupatorieae > Ageratina Asteraceae > tribe Eupatorieae > Ageratina
Sibling taxa
A. adenophora, A. altissima, A. aromatica, A. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
A. adenophora, A. altissima, A. aromatica, A. havanensis, A. herbacea, A. jucunda, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium havanense Eupatorium lemmonii
Name authority (Kunth) R. M. King & H. Robinson: Phytologia 19: 222. (1970) (B. L. Robinson) R. M. King & H. Robinson: Phytologia 19: 223. (1970)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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